Being a critical component, move Karpenter to kube-system namespace

[chomatdam]

@josmo's issue:

https://karpenter.sh/preview/upgrading/upgrade-guide/#upgrading-to-v0330 && https://karpenter.sh/preview/upgrading/upgrade-guide/#upgrading-to-v0340

1. We now recommend that you set the installation namespace for your Karpenter controllers to kube-system